The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2002
Filed:
Oct. 31, 2000
Kenji Suzuki, Chiba, JP;
Masao Kasuga, Chiba, JP;
Akihiro Iino, Chiba, JP;
Takayuki Kosaka, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
An ultrasonic motor with increased output power per unit volume is provided by simultaneously driving all of a plurality of polarized segments of a piezoelectric element having a circular disk shape and divided into a multiple of four polarized segments in a circumferential direction. Projections are provided at upper faces of the polarized segments of the piezoelectric element and spaced apart by an odd number of polarized segments. Polarities of adjacent polarized segments are the same and polarities of adjacent pairs are reverse to each other. A first polarized segment group comprises every other polarized segment and a second polarized segment group comprises the remaining polarized segments. By selecting whether phases of alternating voltages supplied to the first and second polarized segment groups are the same or are 180 degrees out of phase, the direction of the motor is determined.